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cppcheck/test/testother.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2011 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "preprocessor.h"
#include "tokenize.h"
#include "checkother.h"
#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
class TestOther : public TestFixture
{
public:
TestOther() : TestFixture("TestOther")
{ }
private:
void run()
{
TEST_CASE(assignBoolToPointer);
TEST_CASE(zeroDiv1);
TEST_CASE(zeroDiv2);
TEST_CASE(zeroDiv3);
TEST_CASE(zeroDiv4);
TEST_CASE(sprintf1); // Dangerous usage of sprintf
TEST_CASE(sprintf2);
TEST_CASE(sprintf3);
TEST_CASE(sprintf4); // struct member
TEST_CASE(strPlusChar1); // "/usr" + '/'
TEST_CASE(strPlusChar2); // "/usr" + ch
TEST_CASE(strPlusChar3); // ok: path + "/sub" + '/'
TEST_CASE(varScope1);
TEST_CASE(varScope2);
TEST_CASE(varScope3);
TEST_CASE(varScope4);
TEST_CASE(varScope5);
TEST_CASE(varScope6);
TEST_CASE(varScope7);
TEST_CASE(varScope8);
TEST_CASE(varScope9); // classes may have extra side-effects
TEST_CASE(varScope10); // Undefined macro FOR
TEST_CASE(varScope11); // #2475 - struct initialization is not inner scope
TEST_CASE(varScope12); // variable usage in inner loop
TEST_CASE(oldStylePointerCast);
TEST_CASE(dangerousStrolUsage);
TEST_CASE(passedByValue);
TEST_CASE(mathfunctionCall1);
TEST_CASE(fflushOnInputStreamTest);
TEST_CASE(sizeofsizeof);
TEST_CASE(sizeofCalculation);
TEST_CASE(switchRedundantAssignmentTest);
TEST_CASE(switchFallThroughCase);
TEST_CASE(duplicateBreak);
TEST_CASE(selfAssignment);
TEST_CASE(testScanf1);
TEST_CASE(testScanf2);
TEST_CASE(trac1132);
TEST_CASE(testMisusedScopeObjectDoesNotPickFunction1);
TEST_CASE(testMisusedScopeObjectDoesNotPickFunction2);
TEST_CASE(testMisusedScopeObjectPicksClass);
TEST_CASE(testMisusedScopeObjectPicksStruct);
TEST_CASE(testMisusedScopeObjectDoesNotPickIf);
TEST_CASE(testMisusedScopeObjectDoesNotPickConstructorDeclaration);
TEST_CASE(testMisusedScopeObjectDoesNotPickFunctor);
TEST_CASE(testMisusedScopeObjectDoesNotPickLocalClassConstructors);
TEST_CASE(testMisusedScopeObjectDoesNotPickUsedObject);
TEST_CASE(testMisusedScopeObjectDoesNotPickPureC);
TEST_CASE(testMisusedScopeObjectDoesNotPickNestedClass);
TEST_CASE(trac2071);
TEST_CASE(trac2084);
TEST_CASE(assignmentInAssert);
TEST_CASE(incorrectLogicOperator1);
TEST_CASE(incorrectLogicOperator2);
TEST_CASE(catchExceptionByValue);
TEST_CASE(memsetZeroBytes);
TEST_CASE(sizeofForArrayParameter);
TEST_CASE(sizeofForNumericParameter);
TEST_CASE(clarifyCalculation);
TEST_CASE(clarifyCondition); // if (a = b() < 0)
TEST_CASE(incorrectStringCompare);
TEST_CASE(incrementBoolean);
TEST_CASE(comparisonOfBoolWithInt);
TEST_CASE(duplicateIf);
TEST_CASE(duplicateBranch);
TEST_CASE(duplicateExpression1);
TEST_CASE(duplicateExpression2); // ticket #2730
TEST_CASE(alwaysTrueFalseStringCompare);
TEST_CASE(checkSignOfUnsignedVariable);
}
void check(const char code[], const char *filename = NULL)
{
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("style");
settings.inconclusive = true;
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, filename ? filename : "test.cpp");
// Check..
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.sizeofsizeof();
checkOther.sizeofCalculation();
checkOther.checkRedundantAssignmentInSwitch();
checkOther.checkAssignmentInAssert();
checkOther.checkSizeofForArrayParameter();
checkOther.checkSizeofForNumericParameter();
checkOther.clarifyCondition();
checkOther.checkDuplicateIf();
checkOther.checkDuplicateBranch();
checkOther.checkDuplicateExpression();
// Simplify token list..
tokenizer.simplifyTokenList();
checkOther.checkZeroDivision();
checkOther.checkMathFunctions();
checkOther.checkFflushOnInputStream();
checkOther.checkSelfAssignment();
checkOther.invalidScanf();
checkOther.checkMisusedScopedObject();
checkOther.checkIncorrectLogicOperator();
checkOther.checkCatchExceptionByValue();
checkOther.checkMemsetZeroBytes();
checkOther.clarifyCalculation();
checkOther.checkIncorrectStringCompare();
checkOther.checkIncrementBoolean();
checkOther.checkComparisonOfBoolWithInt();
checkOther.checkDuplicateBreak();
checkOther.checkAssignBoolToPointer();
}
class SimpleSuppressor: public ErrorLogger
{
public:
SimpleSuppressor(Settings &settings, ErrorLogger *next)
: _settings(settings), _next(next)
{ }
virtual void reportOut(const std::string &outmsg)
{
_next->reportOut(outmsg);
}
virtual void reportErr(const ErrorLogger::ErrorMessage &msg)
{
if (!msg._callStack.empty() && !_settings.nomsg.isSuppressed(msg._id, msg._callStack.begin()->getfile(), msg._callStack.begin()->line))
_next->reportErr(msg);
}
private:
Settings &_settings;
ErrorLogger *_next;
};
void check_preprocess_suppress(const char precode[], const char *filename = NULL)
{
// Clear the error buffer..
errout.str("");
if (filename == NULL)
filename = "test.cpp";
Settings settings;
settings.addEnabled("style");
settings.experimental = true;
// Preprocess file..
Preprocessor preprocessor(&settings, this);
std::list<std::string> configurations;
std::string filedata = "";
std::istringstream fin(precode);
preprocessor.preprocess(fin, filedata, configurations, filename, settings._includePaths);
SimpleSuppressor logger(settings, this);
const std::string code = Preprocessor::getcode(filedata, "", filename, &settings, &logger);
// Tokenize..
Tokenizer tokenizer(&settings, &logger);
std::istringstream istr(code);
tokenizer.tokenize(istr, filename);
tokenizer.simplifyGoto();
// Check..
CheckOther checkOther(&tokenizer, &settings, &logger);
checkOther.checkSwitchCaseFallThrough();
checkOther.checkAlwaysTrueOrFalseStringCompare();
logger.reportUnmatchedSuppressions(settings.nomsg.getUnmatchedLocalSuppressions(filename));
}
void assignBoolToPointer()
{
check("void foo(bool *p) {\n"
" p = false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Assigning bool value to pointer (converting bool value to address)\n", errout.str());
}
void zeroDiv1()
{
check("void foo()\n"
"{\n"
" int a = 0;\n"
" double b = 1.;\n"
" cout<<b/a;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Division by zero\n", errout.str());
}
void zeroDiv2()
{
check("void foo()\n"
"{\n"
" int sum = 0;\n"
" int n = 100;\n"
" for(int i = 0; i < n; i ++)\n"
" {\n"
" sum += i; \n"
" }\n"
" cout<<b/sum;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int a = 0 ? (2/0) : 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void zeroDiv3()
{
check("void f()\n"
"{\n"
" div_t divresult = div (1,0);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
}
void zeroDiv4()
{
check("void f()\n"
"{\n"
" long a = b / 0x6;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" long a = b / 0x0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
check("void f()\n"
"{\n"
" long a = b / 0L;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
check("void f()\n"
"{\n"
" long a = b / 0ul;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
check("void f()\n"
"{\n"
" div_t divresult = div (1,0L);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
check("void f()\n"
"{\n"
" div_t divresult = div (1,0x5);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Don't warn about floating points (gcc doesn't warn either)
// and floating points are handled differently than integers.
check("void f()\n"
"{\n"
" long a = b / 0.0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" long a = b / 0.5;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Don't warn about 0.0
check("void f()\n"
"{\n"
" div_t divresult = div (1,0.0);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" div_t divresult = div (1,0.5);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sprintfUsage(const char code[])
{
// Clear the error buffer..
errout.str("");
Settings settings;
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.setVarId();
//tokenizer.tokens()->printOut( "tokens" );
// Check for redundant code..
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.invalidFunctionUsage();
}
void sprintf1()
{
sprintfUsage("void foo()\n"
"{\n"
" char buf[100];\n"
" sprintf(buf,\"%s\",buf);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Undefined behavior: variable is used as parameter and destination in s[n]printf().\n", errout.str());
}
void sprintf2()
{
sprintfUsage("void foo()\n"
"{\n"
" char buf[100];\n"
" sprintf(buf,\"%i\",sizeof(buf));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sprintf3()
{
sprintfUsage("void foo()\n"
"{\n"
" char buf[100];\n"
" sprintf(buf,\"%i\",sizeof(buf));\n"
" if (buf[0]);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sprintf4()
{
sprintfUsage("struct A\n"
"{\n"
" char filename[128];\n"
"};\n"
"\n"
"void foo()\n"
"{\n"
" const char* filename = \"hello\";\n"
" struct A a;\n"
" snprintf(a.filename, 128, \"%s\", filename);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void strPlusChar(const char code[])
{
// Clear the error buffer..
errout.str("");
Settings settings;
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.setVarId();
// Check for redundant code..
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.strPlusChar();
}
void strPlusChar1()
{
// Strange looking pointer arithmetic..
strPlusChar("void foo()\n"
"{\n"
" const char *p = \"/usr\" + '/';\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Unusual pointer arithmetic\n", errout.str());
}
void strPlusChar2()
{
// Strange looking pointer arithmetic..
strPlusChar("void foo()\n"
"{\n"
" char ch = 1;\n"
" const char *p = ch + \"/usr\";\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Strange looking pointer arithmetic..
strPlusChar("void foo()\n"
"{\n"
" int i = 1;\n"
" const char* psz = \"Bla\";\n"
" const std::string str = i + psz;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void strPlusChar3()
{
// Strange looking pointer arithmetic..
strPlusChar("void foo()\n"
"{\n"
" std::string temp = \"/tmp\";\n"
" std::string path = temp + '/' + \"sub\" + '/';\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope(const char code[])
{
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("information");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Check for redundant code..
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.checkVariableScope();
}
void varScope1()
{
varScope("unsigned short foo()\n"
"{\n"
" test_client CClient;\n"
" try\n"
" {\n"
" if (CClient.Open())\n"
" {\n"
" return 0;\n"
" }\n"
" }\n"
" catch (...)\n"
" {\n"
" return 2;\n"
" }\n"
"\n"
" try\n"
" {\n"
" CClient.Close();\n"
" }\n"
" catch (...)\n"
" {\n"
" return 2;\n"
" }\n"
"\n"
" return 1;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope2()
{
varScope("int foo()\n"
"{\n"
" Error e;\n"
" e.SetValue(12);\n"
" throw e;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope3()
{
varScope("void foo()\n"
"{\n"
" int i;\n"
" int *p = 0;\n"
" if (abc)\n"
" {\n"
" p = &i;\n"
" }\n"
" *p = 1;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope4()
{
varScope("void foo()\n"
"{\n"
" int i;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope5()
{
varScope("void f(int x)\n"
"{\n"
" int i = 0;\n"
" if (x) {\n"
" for ( ; i < 10; ++i) ;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (information) The scope of the variable 'i' can be reduced\n", errout.str());
varScope("void f(int x)\n"
"{\n"
" int i = 0;\n"
" if (x) {b()}\n"
" else {\n"
" for ( ; i < 10; ++i) ;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (information) The scope of the variable 'i' can be reduced\n", errout.str());
}
void varScope6()
{
varScope("void f(int x)\n"
"{\n"
" int i = x;\n"
" if (a) {\n"
" x++;\n"
" }\n"
" if (b) {\n"
" c(i);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
varScope("void f()\n"
"{\n"
"int foo = 0;\n"
"std::vector<int> vec(10);\n"
"BOOST_FOREACH(int& i, vec)\n"
"{\n"
" foo += 1;\n"
" if(foo == 10)\n"
" {\n"
" return 0;\n"
" }\n"
"}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
varScope("void f(int &x)\n"
"{\n"
" int n = 1;\n"
" do\n"
" {\n"
" ++n;\n"
" ++x;\n"
" } while (x);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope7()
{
varScope("void f(int x)\n"
"{\n"
" int y = 0;\n"
" b(y);\n"
" if (x) {\n"
" y++;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope8()
{
varScope("void test() {\n"
" float edgeResistance=1;\n"
" std::vector<int> edges;\n"
" BOOST_FOREACH(int edge, edges) {\n"
" edgeResistance = (edge+1) / 2.0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (information) The scope of the variable 'edgeResistance' can be reduced\n", errout.str());
}
void varScope9()
{
// classes may have extra side effects
varScope("class fred {\n"
"public:\n"
" void x();\n"
"};\n"
"void test(int a) {\n"
" fred f;\n"
" if (a == 2) {\n"
" f.x();\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope10()
{
// classes may have extra side effects
varScope("int f()\n"
"{\n"
" int x = 0;\n"
" FOR {\n"
" foo(x++);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope11()
{
varScope("int f() {\n"
" int x = 0;\n"
" AB ab = { x, 0 };\n"
"}\n");
ASSERT_EQUALS("", errout.str());
varScope("int f() {\n"
" int x = 0;\n"
" if (a == 0) { ++x; }\n"
" AB ab = { x, 0 };\n"
"}\n");
ASSERT_EQUALS("", errout.str());
varScope("int f() {\n"
" int x = 0;\n"
" if (a == 0) { ++x; }\n"
" if (a == 1) { AB ab = { x, 0 }; }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope12()
{
// #2770
varScope("void f() {\n"
" int i = 0;\n"
" forever {\n"
" if (i++ == 42) { break; }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void checkOldStylePointerCast(const char code[])
{
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("style");
// Tokenize..
Tokenizer tokenizerCpp(&settings, this);
std::istringstream istr(code);
tokenizerCpp.tokenize(istr, "test.cpp");
tokenizerCpp.setVarId();
Tokenizer tokenizerC(&settings, this);
std::istringstream istr2(code);
tokenizerC.tokenize(istr2, "test.c");
tokenizerC.setVarId();
CheckOther checkOtherCpp(&tokenizerCpp, &settings, this);
checkOtherCpp.warningOldStylePointerCast();
CheckOther checkOtherC(&tokenizerC, &settings, this);
checkOtherC.warningOldStylePointerCast();
}
void oldStylePointerCast()
{
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (Base *) derived;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (const Base *) derived;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (const Base *) ( new Derived() );\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (const Base *) new Derived();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (const Base *) new short[10];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class B;\n"
"class A\n"
"{\n"
" virtual void abc(B *) const = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkOldStylePointerCast("class B;\n"
"class A\n"
"{\n"
" virtual void abc(const B *) const = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void dangerousStrolUsage()
{
{
sprintfUsage("int f(const char *num)\n"
"{\n"
" return strtol(num, NULL, 1);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Invalid radix in call to strtol or strtoul. Must be 0 or 2-36\n", errout.str());
}
{
sprintfUsage("int f(const char *num)\n"
"{\n"
" return strtol(num, NULL, 10);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
}
void testPassedByValue(const char code[])
{
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("style");
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.checkConstantFunctionParameter();
}
void passedByValue()
{
testPassedByValue("void f(const std::string str) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'str' should be passed by reference.\n", errout.str());
testPassedByValue("class Foo;\nvoid f(const Foo foo) {}");
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'foo' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::string &str) {}");
ASSERT_EQUALS("", errout.str());
testPassedByValue("void f(const std::vector<int> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::vector<std::string> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::vector<int> &v) {}");
ASSERT_EQUALS("", errout.str());
testPassedByValue("void f(const std::map<int,int> &v) {}");
ASSERT_EQUALS("", errout.str());
testPassedByValue("void f(const std::map<int,int> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::map<std::string,std::string> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::map<int,std::string> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::map<std::string,int> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::streamoff pos) {}");
ASSERT_EQUALS("", errout.str());
}
void mathfunctionCall1()
{
// log|log10
check("void foo()\n"
"{\n"
" std::cout << log(-2) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -2 to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(-1.) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -1. to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(-1.0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -1.0 to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(-0.1) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -0.1 to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 0 to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(0.) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 0. to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(0.0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 0.0 to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(1.0E+3) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(1.0E-3) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(1E-3) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::string *log(0);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(2.0) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
// acos
check("void foo()\n"
"{\n"
" std::cout << acos(1) << std::endl;\n"
" std::cout << acos(-1) << std::endl;\n"
" std::cout << acos(0.1) << std::endl;\n"
" std::cout << acos(0.0001) << std::endl;\n"
" std::cout << acos(0.01) << std::endl;\n"
" std::cout << acos(1.0E-1) << std::endl;\n"
" std::cout << acos(-1.0E-1) << std::endl;\n"
" std::cout << acos(+1.0E-1) << std::endl;\n"
" std::cout << acos(0.1E-1) << std::endl;\n"
" std::cout << acos(+0.1E-1) << std::endl;\n"
" std::cout << acos(-0.1E-1) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << acos(1.1) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 1.1 to acos() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << acos(-1.1) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -1.1 to acos() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << acos(-110) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -110 to acos() leads to undefined result\n", errout.str());
// atan2
check("void foo()\n"
"{\n"
" std::cout << atan2(1,1) << std::endl;\n"
" std::cout << atan2(-1,-1) << std::endl;\n"
" std::cout << atan2(0.1,1) << std::endl;\n"
" std::cout << atan2(0.0001,100) << std::endl;\n"
" std::cout << atan2(0.01m-1) << std::endl;\n"
" std::cout << atan2(1.0E-1,-3) << std::endl;\n"
" std::cout << atan2(-1.0E-1,+2) << std::endl;\n"
" std::cout << atan2(+1.0E-1,0) << std::endl;\n"
" std::cout << atan2(0.1E-1,3) << std::endl;\n"
" std::cout << atan2(+0.1E-1,1) << std::endl;\n"
" std::cout << atan2(-0.1E-1,8) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << atan2(0,0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 0 and 0 to atan2() leads to undefined result\n", errout.str());
// fmod
check("void foo()\n"
"{\n"
" std::cout << fmod(1.0,0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 1.0 and 0 to fmod() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << fmod(1.0,1) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
// pow
check("void foo()\n"
"{\n"
" std::cout << pow(0,-10) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 0 and -10 to pow() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << pow(0,10) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
// sqrt
check("void foo()\n"
"{\n"
" std::cout << sqrt(-1) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -1 to sqrt() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << sqrt(1) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void fflushOnInputStreamTest()
{
check("void foo()\n"
"{\n"
" fflush(stdin);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) fflush() called on input stream \"stdin\" may result in undefined behaviour\n", errout.str());
check("void foo()\n"
"{\n"
" fflush(stdout);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sizeofsizeof()
{
check("void foo()\n"
"{\n"
" int i = sizeof sizeof char;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (warning) Calling sizeof for 'sizeof'.\n", errout.str());
check("void foo()\n"
"{\n"
" int i = sizeof (sizeof long);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (warning) Calling sizeof for 'sizeof'.\n", errout.str());
check("void foo(long *p)\n"
"{\n"
" int i = sizeof (sizeof (p));\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (warning) Calling sizeof for 'sizeof'.\n", errout.str());
}
void sizeofCalculation()
{
check("sizeof(a+b)");
ASSERT_EQUALS("[test.cpp:1]: (warning) Found calculation inside sizeof()\n", errout.str());
check("sizeof(-a)");
ASSERT_EQUALS("", errout.str());
check("sizeof(void * const)");
ASSERT_EQUALS("", errout.str());
}
void switchRedundantAssignmentTest()
{
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (warning) Redundant assignment of \"y\" in switch\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" {\n"
" y = 2;\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (warning) Redundant assignment of \"y\" in switch\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" case 3:\n"
" if (x)\n"
" {\n"
" y = 3;\n"
" }\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" {\n"
" y = 2;\n"
" if (y)\n"
" printf(\"%d\", y);\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int x = a;\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" x = 2;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" {\n"
" int y = 2;\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" break;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" while(xyz()) {\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" continue;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" while(xyz()) {\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" throw e;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" printf(\"%d\", y);\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" bar();\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void switchFallThroughCase()
{
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" break;\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" break;\n"
" case 2:\n"
" continue;\n"
" case 3:\n"
" return;\n"
" case 4:\n"
" exit(1);\n"
" case 5:\n"
" goto end;\n"
" case 6:\n"
" throw e;\n"
" case 7:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 0:\n"
" case 1:\n"
" break;\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (style) Switch falls through case without comment\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" default:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (style) Switch falls through case without comment\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" // fall through\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" /* FALLTHRU */\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" break;\n"
" // fall through\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (information) Unmatched suppression: switchCaseFallThrough\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" {\n"
" break;\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" for (;;) {\n"
" break;\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (style) Switch falls through case without comment\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" if (b) {\n"
" break;\n"
" } else {\n"
" break;\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" if (b) {\n"
" break;\n"
" } else {\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (style) Switch falls through case without comment\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" if (b) {\n"
" break;\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (style) Switch falls through case without comment\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" if (b) {\n"
" } else {\n"
" break;\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (style) Switch falls through case without comment\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" if (b) {\n"
" case 2:\n"
" } else {\n"
" break;\n"
" }\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (style) Switch falls through case without comment\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" int x;\n"
" case 1:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" switch (b) {\n"
" case 1:\n"
" return;\n"
" default:\n"
" return;\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
// This fails because the switch parsing code currently doesn't understand
// that all paths after g() actually return. It's a pretty unusual case
// (no pun intended).
TODO_ASSERT_EQUALS("",
"[test.cpp:11]: (style) Switch falls through case without comment\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
"#ifndef A\n"
" g();\n"
" // fall through\n"
"#endif\n"
" case 2:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" goto leave;\n"
" case 2:\n"
" break;\n"
" }\n"
"leave:\n"
" if (x) {\n"
" g();\n"
" return;\n"
" }\n"
"}\n");
// This fails because Tokenizer::simplifyGoto() copies the "leave:" block
// into where the goto is, but because it contains a "return", it omits
// copying a final return after the block.
TODO_ASSERT_EQUALS("",
"[test.cpp:5]: (style) Switch falls through case without comment\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" // fall through\n"
" case 2:\n"
" g();\n"
" // falls through\n"
" case 3:\n"
" g();\n"
" // fall-through\n"
" case 4:\n"
" g();\n"
" // drop through\n"
" case 5:\n"
" g();\n"
" // pass through\n"
" case 5:\n"
" g();\n"
" // no break\n"
" case 5:\n"
" g();\n"
" // fallthru\n"
" case 6:\n"
" g();\n"
" /* fall */\n"
" default:\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" // unrelated comment saying 'fall through'\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void duplicateBreak()
{
check("void foo(int a)\n"
"{\n"
" switch(a) {\n"
" case 0:\n"
" printf(\"case 0\");\n"
" break;\n"
" break;\n"
" case 1:\n"
" c++;\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (style) Consecutive break or continue statements are unnecessary\n", errout.str());
check("void foo(int a)\n"
"{\n"
" switch(a) {\n"
" case 0:\n"
" printf(\"case 0\");\n"
" break;\n"
" case 1:\n"
" c++;\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo(int a)\n"
"{\n"
" while(1) {\n"
" if (a++ >= 100) {\n"
" break;\n"
" break;\n"
" }\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (style) Consecutive break or continue statements are unnecessary\n", errout.str());
check("void foo(int a)\n"
"{\n"
" while(1) {\n"
" if (a++ >= 100) {\n"
" continue;\n"
" continue;\n"
" }\n"
" a+=2;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (style) Consecutive break or continue statements are unnecessary\n", errout.str());
check("void foo(int a)\n"
"{\n"
" while(1) {\n"
" if (a++ >= 100) {\n"
" continue;\n"
" }\n"
" a+=2;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void selfAssignment()
{
check("void foo()\n"
"{\n"
" int x = 1;\n"
" x = x;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (warning) Redundant assignment of \"x\" to itself\n", errout.str());
check("void foo()\n"
"{\n"
" int x = x;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (warning) Redundant assignment of \"x\" to itself\n", errout.str());
check("void foo()\n"
"{\n"
" std::string var = var = \"test\";\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:3]: (warning) Redundant assignment of \"var\" to itself\n", "", errout.str());
check("void foo()\n"
"{\n"
" int x = 1;\n"
" x = x + 1;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int *x = getx();\n"
" *x = x;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// non-primitive type -> there might be some side effects
check("void foo()\n"
"{\n"
" Fred fred; fred = fred;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" x = (x == 0);"
" func(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" x = (x != 0);"
" func(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testScanf1()
{
check("#include <stdio.h>\n"
"int main(int argc, char **argv)\n"
"{\n"
" int a, b;\n"
" FILE *file = fopen(\"test\", \"r\");\n"
" b = fscanf(file, \"aa %ds\", &a);\n"
" c = scanf(\"aa %ds\", &a);\n"
" b = fscanf(file, \"aa%%ds\", &a);\n"
" fclose(file);\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (warning) scanf without field width limits can crash with huge input data\n"
"[test.cpp:7]: (warning) scanf without field width limits can crash with huge input data\n", errout.str());
}
void testScanf2()
{
check("#include <stdio.h>\n"
"int main(int argc, char **argv)\n"
"{\n"
" int a, b;\n"
" FILE *file = fopen(\"test\", \"r\");\n"
" b = fscanf(file, \"aa%%%ds\", &a);\n"
" c = scanf(\"aa %%%ds\", &a);\n"
" b = fscanf(file, \"aa%%ds\", &a);\n"
" fclose(file);\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (warning) scanf without field width limits can crash with huge input data\n"
"[test.cpp:7]: (warning) scanf without field width limits can crash with huge input data\n", errout.str());
}
void trac1132()
{
std::istringstream code("#include <iostream>\n"
"class Lock\n"
"{\n"
"public:\n"
" Lock(int i)\n"
" {\n"
" std::cout << \"Lock \" << i << std::endl;\n"
" }\n"
" ~Lock()\n"
" {\n"
" std::cout << \"~Lock\" << std::endl;\n"
" }\n"
"};\n"
"int main()\n"
"{\n"
" Lock(123);\n"
" std::cout << \"hello\" << std::endl;\n"
" return 0;\n"
"}\n"
);
errout.str("");
Settings settings;
Tokenizer tokenizer(&settings, this);
tokenizer.tokenize(code, "trac1132.cpp");
tokenizer.simplifyTokenList();
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.checkMisusedScopedObject();
ASSERT_EQUALS("[trac1132.cpp:16]: (error) instance of \"Lock\" object destroyed immediately\n", errout.str());
}
void testMisusedScopeObjectDoesNotPickFunction1()
{
check("int main ( )\n"
"{\n"
" CouldBeFunction ( 123 ) ;\n"
" return 0 ;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickFunction2()
{
check("struct error {\n"
" error() {}\n"
"};\n"
"\n"
"class parser {\n"
"public:\n"
" void error() const {}\n"
"\n"
" void foo() const {\n"
" error();\n"
" }\n"
"};\n"
);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectPicksClass()
{
check("class NotAFunction ;\n"
"int function ( )\n"
"{\n"
" NotAFunction ( 123 );\n"
" return 0 ;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:4]: (error) instance of \"NotAFunction\" object destroyed immediately\n", errout.str());
}
void testMisusedScopeObjectPicksStruct()
{
check("struct NotAClass;\n"
"bool func ( )\n"
"{\n"
" NotAClass ( 123 ) ;\n"
" return true ;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:4]: (error) instance of \"NotAClass\" object destroyed immediately\n", errout.str());
}
void testMisusedScopeObjectDoesNotPickIf()
{
check("bool func( int a , int b , int c )\n"
"{\n"
" if ( a > b ) return c == a ;\n"
" return b == a ;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickConstructorDeclaration()
{
check("class Something : public SomthingElse\n"
"{\n"
"public:\n"
"~Something ( ) ;\n"
"Something ( ) ;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickFunctor()
{
check("\n"
"#include <algorithm>\n"
"\n"
"class IncrementFunctor\n"
"{\n"
"public:\n"
" void operator()(int &i)\n"
" {\n"
" ++i;\n"
" }\n"
"};\n"
"\n"
"int main()\n"
"{\n"
" int a = 1;\n"
" IncrementFunctor()(a);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickLocalClassConstructors()
{
check("void f() {\n"
" class Foo {\n"
" Foo() { }\n"
" Foo(int a) { }\n"
" Foo(int a, int b) { }\n"
" };\n"
" Foo();\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:7]: (error) instance of \"Foo\" object destroyed immediately\n", errout.str());
}
void testMisusedScopeObjectDoesNotPickUsedObject()
{
check("struct Foo {\n"
" void bar() {\n"
" }\n"
"};\n"
"\n"
"void fn() {\n"
" Foo().bar();\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickPureC()
{
// Ticket #2352
const char code[] = "struct cb_watch_bool {\n"
" int a;\n"
"};\n"
"\n"
"void f()\n"
"{\n"
" cb_watch_bool();\n"
"}\n";
check(code, "test.cpp");
ASSERT_EQUALS("[test.cpp:7]: (error) instance of \"cb_watch_bool\" object destroyed immediately\n", errout.str());
check(code, "test.c");
ASSERT_EQUALS("", errout.str());
// Ticket #2639
check("struct stat { int a; int b; };\n"
"void stat(const char *fn, struct stat *);\n"
"\n"
"void foo() {\n"
" stat(\"file.txt\", &st);\n"
"}\n");
ASSERT_EQUALS("",errout.str());
}
void testMisusedScopeObjectDoesNotPickNestedClass()
{
const char code[] = "class ios_base {\n"
"public:\n"
" class Init {\n"
" public:\n"
" };\n"
"};\n"
"class foo {\n"
"public:\n"
" foo();\n"
" void Init(int);\n"
"};\n"
"foo::foo() {\n"
" Init(0);\n"
"}\n";
check(code, "test.cpp");
ASSERT_EQUALS("", errout.str());
}
void trac2084()
{
check("#include <signal.h>\n"
"\n"
"void f()\n"
"{\n"
" struct sigaction sa;\n"
"\n"
" { sigaction(SIGHUP, &sa, 0); };\n"
" { sigaction(SIGINT, &sa, 0); };\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void trac2071()
{
check("void f() {\n"
" struct AB {\n"
" AB(int a) { }\n"
" };\n"
"\n"
" const AB ab[3] = { AB(0), AB(1), AB(2) };\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void assignmentInAssert()
{
check("void f() {\n"
" int a = 0;\n"
" assert(a = 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'.\n", errout.str());
check("void f() {\n"
" int a = 0;\n"
" assert(a == 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a = 0;\n"
" int b = 0;\n"
" assert(a == 2 && b = 1);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:4]: (warning) Assert statement modifies 'b'.\n", errout.str());
check("void f() {\n"
" int a = 0;\n"
" assert(a += 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'.\n", errout.str());
check("void f() {\n"
" int a = 0;\n"
" assert(a *= 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'.\n", errout.str());
check("void f() {\n"
" int a = 0;\n"
" assert(a -= 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'.\n", errout.str());
check("void f() {\n"
" int a = 0;\n"
" assert(a --);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'.\n", errout.str());
}
void incorrectLogicOperator1()
{
check("void f(int x) {\n"
" if ((x != 1) || (x != 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Mutual exclusion over || always evaluates to true. Did you intend to use && instead?\n", errout.str());
check("void f(int x) {\n"
" if (x != 1 || x != 3)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Mutual exclusion over || always evaluates to true. Did you intend to use && instead?\n", errout.str());
check("void f(int x) {\n"
" if (1 != x || 3 != x)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Mutual exclusion over || always evaluates to true. Did you intend to use && instead?\n", errout.str());
check("void f(int x, int y) {\n"
" if (x != 1 || y != 1)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((y == 1) && (x != 1) || (x != 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((x != 1) || (x != 3) && (y == 1))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if ((x != 1) && (x != 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if ((x == 1) || (x == 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((x != 1) || (y != 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((x != hotdog) || (y != hotdog))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((x != 5) || (y != 5))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" const int ERR1 = 5;\n"
" const int ERR2 = 6;\n"
" if ((x != ERR1) || (x != ERR2))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:4]: (warning) Mutual exclusion over || always evaluates to true. Did you intend to use && instead?\n", errout.str());
check("void f(int x, int y) {\n"
" const int ERR1 = 5;\n"
" if ((x != ERR1) || (y != ERR1))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(unsigned int a, unsigned int b, unsigned int c) {\n"
" if((a != b) || (c != b) || (c != a))\n"
" {\n"
" return true;\n"
" }\n"
" return false;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void incorrectLogicOperator2()
{
check("void f(int x) {\n"
" if ((x == 1) && (x == 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Expression always evaluates to false. Did you intend to use || instead?\n", errout.str());
check("void f(int x) {\n"
" if ((x == 1.0) && (x == 3.0))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Expression always evaluates to false. Did you intend to use || instead?\n", errout.str());
check("void f(float x) {\n"
" if ((x == 1) && (x == 1.0))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if ((x == 1) && (x == 0x00000001))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if (x == 1 && x == 3)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Expression always evaluates to false. Did you intend to use || instead?\n", errout.str());
check("void f(int x) {\n"
" if (x == 1.0 && x == 3.0)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Expression always evaluates to false. Did you intend to use || instead?\n", errout.str());
check("void f(float x) {\n"
" if (x == 1 && x == 1.0)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if (x < 1 && x > 1)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Expression always evaluates to false. Did you intend to use || instead?\n", errout.str());
check("void f(int x) {\n"
" if (x < 1.0 && x > 1.0)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Expression always evaluates to false. Did you intend to use || instead?\n", errout.str());
check("void f(int x) {\n"
" if (x < 1 && x > 1.0)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Expression always evaluates to false. Did you intend to use || instead?\n", errout.str());
check("void f(int x) {\n"
" if (x < 1 && x > 3)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Expression always evaluates to false. Did you intend to use || instead?\n", errout.str());
check("void f(float x) {\n"
" if (x < 1.0 && x > 3.0)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Expression always evaluates to false. Did you intend to use || instead?\n", errout.str());
check("void f(int x) {\n"
" if (1 > x && 3 < x)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Expression always evaluates to false. Did you intend to use || instead?\n", errout.str());
check("void f(int x) {\n"
" if (x < 1 && x > 1)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Expression always evaluates to false. Did you intend to use || instead?\n", errout.str());
check("void f(int x) {\n"
" if (x < 3 && x > 1)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if (x > 3 || x < 10)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Mutual exclusion over || always evaluates to true. Did you intend to use && instead?\n", errout.str());
check("void f(int x) {\n"
" if (x >= 3 || x <= 10)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Mutual exclusion over || always evaluates to true. Did you intend to use && instead?\n", errout.str());
check("void f(int x) {\n"
" if (x >= 3 || x < 10)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Mutual exclusion over || always evaluates to true. Did you intend to use && instead?\n", errout.str());
check("void f(int x) {\n"
" if (x > 3 || x <= 10)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Mutual exclusion over || always evaluates to true. Did you intend to use && instead?\n", errout.str());
check("void f(int x) {\n"
" if (x > 3 || x < 3)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if (x >= 3 || x <= 3)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if (x >= 3 || x < 3)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if (x > 3 || x <= 3)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if (x > 10 || x < 3)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void catchExceptionByValue()
{
check("void f() {\n"
" try\n"
" {\n"
" foo();\n"
" }\n"
" catch( ::std::exception err)\n"
" {\n"
" throw err;\n"
" }\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:6]: (style) Exception should be caught by reference.\n", errout.str());
check("void f() {\n"
" try\n"
" {\n"
" foo();\n"
" }\n"
" catch(const exception err)\n"
" {\n"
" throw err;\n"
" }\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:6]: (style) Exception should be caught by reference.\n", errout.str());
check("void f() {\n"
" try\n"
" {\n"
" foo();\n"
" }\n"
" catch( ::std::exception& err)\n"
" {\n"
" throw err;\n"
" }\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" try\n"
" {\n"
" foo();\n"
" }\n"
" catch(exception* err)\n"
" {\n"
" throw err;\n"
" }\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" try\n"
" {\n"
" foo();\n"
" }\n"
" catch(const exception& err)\n"
" {\n"
" throw err;\n"
" }\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" try\n"
" {\n"
" foo();\n"
" }\n"
" catch(int err)\n"
" {\n"
" throw err;\n"
" }\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" try\n"
" {\n"
" foo();\n"
" }\n"
" catch(exception* const err)\n"
" {\n"
" throw err;\n"
" }\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void memsetZeroBytes()
{
check("void f() {\n"
" memset(p, 10, 0)\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) memset() called to fill 0"
" bytes of \'p\'\n", errout.str());
check("void f() {\n"
" memset(p, sizeof(p), 0)\n"
"}\n"
);
TODO_ASSERT_EQUALS("[test.cpp:2]: (warning) memset() called to fill 0"
" bytes of \"p\". Second and third arguments might be inverted.\n",
"", errout.str());
}
void sizeofForArrayParameter()
{
check("void f() {\n"
" int a[10];\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" unsigned int a = 2;\n"
" unsigned int b = 2;\n"
" int c[(a+b)];\n"
" std::cout << sizeof(c) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" unsigned int a = { 2 };\n"
" unsigned int b[] = { 0 };\n"
" int c[a[b[0]]];\n"
" std::cout << sizeof(c) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" unsigned int a[] = { 1 };\n"
" unsigned int b = 2;\n"
" int c[(a[0]+b)];\n"
" std::cout << sizeof(c) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a[] = { 1, 2, 3 };\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a[3] = { 1, 2, 3 };\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f( int a[]) {\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using sizeof for array given as "
"function argument returns the size of pointer.\n", errout.str());
check("void f( int a[]) {\n"
" std::cout << sizeof a / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using sizeof for array given as "
"function argument returns the size of pointer.\n", errout.str());
check("void f( int a[3] ) {\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using sizeof for array given as "
"function argument returns the size of pointer.\n", errout.str());
check("void f(int *p) {\n"
" p[0] = 0;\n"
" sizeof(p);\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char p[] = \"test\";\n"
" sizeof(p);\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
// ticket 2495
check("void f() {\n"
" static float col[][3]={\n"
" {1,0,0},\n"
" {0,0,1},\n"
" {0,1,0},\n"
" {1,0,1},\n"
" {1,0,1},\n"
" {1,0,1},\n"
" };\n"
" const int COL_MAX=sizeof(col)/sizeof(col[0]);\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
// ticket 155
check("void f() {\n"
" char buff1[1024*64],buff2[sizeof(buff1)*2];\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
// ticket 2510
check("void f( int a[], int b) {\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using sizeof for array given as "
"function argument returns the size of pointer.\n", errout.str());
// ticket 2510
check("void f( int a[3] , int b[2] ) {\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using sizeof for array given as "
"function argument returns the size of pointer.\n", errout.str());
// ticket 2510
check("void f() {\n"
" char buff1[1024*64],buff2[sizeof(buff1)*(2+1)];\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void sizeofForNumericParameter()
{
check("void f() {\n"
" std::cout << sizeof(10) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using sizeof with a numeric constant as function argument might not be what you intended.\n", errout.str());
check("void f() {\n"
" std::cout << sizeof(-10) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using sizeof with a numeric constant as function argument might not be what you intended.\n", errout.str());
check("void f() {\n"
" std::cout << sizeof 10 << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using sizeof with a numeric constant as function argument might not be what you intended.\n", errout.str());
check("void f() {\n"
" std::cout << sizeof -10 << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using sizeof with a numeric constant as function argument might not be what you intended.\n", errout.str());
}
void clarifyCalculation()
{
check("int f(char c) {\n"
" return 10 * (c == 0) ? 1 : 2;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for * and ?\n", errout.str());
check("void f(char c) {\n"
" printf(\"%i\", 10 * (c == 0) ? 1 : 2);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for * and ?\n", errout.str());
// Ticket #2585 - segmentation fault for invalid code
check("abcdef?" "?<"
"123456?" "?>"
"+?" "?=");
ASSERT_EQUALS("", errout.str());
check("void f(char c) {\n"
" printf(\"%i\", 1 + 1 ? 1 : 2);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for + and ?\n", errout.str());
check("void f() {\n"
" std::cout << x << 1 ? 2 : 3;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for << and ?\n", errout.str());
check("void f() {\n"
" int ab = a - b ? 2 : 3;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for - and ?\n", errout.str());
}
// clarify conditions with = and comparison
void clarifyCondition()
{
check("void f() {\n"
" if (x = b() < 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Suspicious condition (assignment+comparison), it can be clarified with parentheses\n", errout.str());
}
void incorrectStringCompare()
{
check("int f() {\n"
" return test.substr( 0 , 4 ) == \"Hello\" ? : 0 : 1 ;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) String literal \"Hello\" doesn't match length argument for substr(4).\n", errout.str());
check("int f() {\n"
" return test.substr( 0 , 5 ) == \"Hello\" ? : 0 : 1 ;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f() {\n"
" return \"Hello\" == test.substr( 0 , 4 ) ? : 0 : 1 ;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) String literal \"Hello\" doesn't match length argument for substr(4).\n", errout.str());
check("int f() {\n"
" return \"Hello\" == test.substr( 0 , 5 ) ? : 0 : 1 ;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void incrementBoolean()
{
check("bool bValue = true;\n"
"bValue++;\n");
ASSERT_EQUALS("[test.cpp:2]: (style) The use of a variable of type bool with the ++ postfix operator is always true and deprecated by the C++ Standard.\n", errout.str());
check("void f(bool test){\n"
" test++;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The use of a variable of type bool with the ++ postfix operator is always true and deprecated by the C++ Standard.\n", errout.str());
check("void f(int test){\n"
" test++;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void comparisonOfBoolWithInt()
{
check("void f(int x) {\n"
" if (!x == 10) {\n"
" printf(\"x not equal to 10\");\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Comparison of a boolean with a non-zero integer\n", errout.str());
check("void f(int x) {\n"
" if (!x != 10) {\n"
" printf(\"x not equal to 10\");\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Comparison of a boolean with a non-zero integer\n", errout.str());
check("void f(int x) {\n"
" if (x != 10) {\n"
" printf(\"x not equal to 10\");\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if (10 == !x) {\n"
" printf(\"x not equal to 10\");\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Comparison of a boolean with a non-zero integer\n", errout.str());
check("void f(int x) {\n"
" if (10 != !x) {\n"
" printf(\"x not equal to 10\");\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Comparison of a boolean with a non-zero integer\n", errout.str());
check("void f(int x) {\n"
" if (10 != x) {\n"
" printf(\"x not equal to 10\");\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateIf()
{
check("void f(int a, int &b) {\n"
" if (a) { b = 1; }\n"
" else if (a) { b = 2; }\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (style) Found duplicate if expressions.\n", errout.str());
check("void f(int a, int &b) {\n"
" if (a == 1) { b = 1; }\n"
" else if (a == 2) { b = 2; }\n"
" else if (a == 1) { b = 3; }\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:2]: (style) Found duplicate if expressions.\n", errout.str());
check("void f(int a, int &b) {\n"
" if (a == 1) { b = 1; }\n"
" else if (a == 2) { b = 2; }\n"
" else if (a == 2) { b = 3; }\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:3]: (style) Found duplicate if expressions.\n", errout.str());
check("void f(int a, int &b) {\n"
" if (a == 1) {\n"
" b = 1;\n"
" if (b == 1) { }\n"
" else if (b == 1) { }\n"
" } else if (a == 2) { b = 2; }\n"
" else if (a == 2) { b = 3; }\n"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:6]: (style) Found duplicate if expressions.\n"
"[test.cpp:5] -> [test.cpp:4]: (style) Found duplicate if expressions.\n", errout.str());
check("void f(int a, int &b) {\n"
" if (a++) { b = 1; }\n"
" else if (a++) { b = 2; }\n"
" else if (a++) { b = 3; }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int a, int &b) {\n"
" if (!strtok(NULL," ")) { b = 1; }\n"
" else if (!strtok(NULL," ")) { b = 2; }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int a, int &b) {\n"
" if ((x = x / 2) < 100) { b = 1; }\n"
" else if ((x = x / 2) < 100) { b = 2; }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateBranch()
{
check("void f(int a, int &b) {\n"
" if (a)\n"
" b = 1;\n"
" else\n"
" b = 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:2]: (style) Found duplicate branches for if and else.\n", errout.str());
check("void f(int a, int &b) {\n"
" if (a) {\n"
" if (a == 1)\n"
" b = 2;\n"
" else\n"
" b = 2;\n"
" } else\n"
" b = 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:3]: (style) Found duplicate branches for if and else.\n", errout.str());
check("int f(int signed, unsigned char value) {\n"
" int ret;\n"
" if (signed)\n"
" ret = (signed char)value;\n"
" else\n"
" ret = (unsigned char)value;\n"
" return ret;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpression1()
{
check("voif foo() {\n"
" if (a == a) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:2]: (style) Same expression on both sides of '=='.\n", errout.str());
check("void fun() {\n"
" return (a && a ||\n"
" b == b &&\n"
" c - c &&\n"
" d > d &&\n"
" e < e &&\n"
" f);\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:2]: (style) Same expression on both sides of '&&'.\n"
"[test.cpp:3] -> [test.cpp:3]: (style) Same expression on both sides of '=='.\n"
"[test.cpp:4] -> [test.cpp:4]: (style) Same expression on both sides of '-'.\n"
"[test.cpp:5] -> [test.cpp:5]: (style) Same expression on both sides of '>'.\n"
"[test.cpp:6] -> [test.cpp:6]: (style) Same expression on both sides of '<'.\n", errout.str());
}
void duplicateExpression2() // ticket #2730
{
check("int main()\n"
"{\n"
" long double ldbl;\n"
" double dbl, in;\n"
" float flt;\n"
" int have_nan = 0;\n"
" ldbl = sqrtl(-1.0);\n"
" dbl = sqrt(-1.0);\n"
" flt = sqrtf(-1.0);\n"
" if (ldbl != ldbl) have_nan = 1;\n"
" if (!(dbl == dbl)) have_nan = 1;\n"
" if (flt != flt) have_nan = 1;\n"
" return have_nan;\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Passing value -1.0 to sqrtl() leads to undefined result\n"
"[test.cpp:8]: (error) Passing value -1.0 to sqrt() leads to undefined result\n"
"[test.cpp:9]: (error) Passing value -1.0 to sqrtf() leads to undefined result\n", errout.str());
}
void alwaysTrueFalseStringCompare()
{
check_preprocess_suppress(
"#define MACRO \"00FF00\"\n"
"int main()\n"
"{\n"
" if (strcmp(MACRO,\"00FF00\") == 0)"
" {"
" std::cout << \"Equal\n\""
" }"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) Comparison of always identical static strings.\n", errout.str());
check_preprocess_suppress(
"int main()\n"
"{\n"
" if (stricmp(\"hotdog\",\"HOTdog\") == 0)"
" {"
" std::cout << \"Equal\n\""
" }"
"}");
ASSERT_EQUALS("[test.cpp:3]: (performance) Unnecessary comparison of static strings.\n", errout.str());
check_preprocess_suppress(
"#define MACRO \"Hotdog\"\n"
"int main()\n"
"{\n"
" if (QString::compare(\"Hamburger\", MACRO) == 0)"
" {"
" std::cout << \"Equal\n\""
" }"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Unnecessary comparison of static strings.\n", errout.str());
check_preprocess_suppress(
"int main()\n"
"{\n"
" if (QString::compare(argv[2], \"hotdog\") == 0)"
" {"
" std::cout << \"Equal\n\""
" }"
"}");
ASSERT_EQUALS("", errout.str());
}
void check_signOfUnsignedVariable(const char code[])
{
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("style");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Check for redundant code..
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.checkSignOfUnsignedVariable();
}
void checkSignOfUnsignedVariable()
{
check_signOfUnsignedVariable(
"bool foo(unsigned int x) {\n"
" if (x < 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned variable 'x' is less than zero.\n", errout.str());
check_signOfUnsignedVariable(
"bool foo(int x) {\n"
" if (x < 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"bool foo(unsigned int x) {\n"
" if (0 > x)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned variable 'x' is less than zero.\n", errout.str());
check_signOfUnsignedVariable(
"bool foo(int x) {\n"
" if (0 > x)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"bool foo(unsigned int x) {\n"
" if (x >= 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned variable 'x' is positive is always true.\n", errout.str());
check_signOfUnsignedVariable(
"bool foo(int x) {\n"
" if (x >= 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestOther)
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